Viewing our experience in this world as a dream, Siddhartha found that our habit of fixating on the mere appearance of our dreamlike relative world, thinking that it is truly existing, throws us into an endless cycle of pain and anxiety. We are in a deep sleep, hibernating like a silkworm in a cocoon. We have woven a reality based on our projections, imagination, hopes, fears, and delusions. Our cocoons have become very solid and sophisticated. Our imaginings are so real to us that we are trapped in the cocoon. But we can free ourselves simply by realizing that this is all our imagination.
From the book by Dzongsar Jamyang Kyentse Rinpoche; What makes you not a Buddhist